That must be the best video on UA-cam. Everybody repeats what he read elsewhere, but you are really going beyond that and pushing your analysis. Awesome work and explanations! Thank you RCCrewChief
i suspect the knees that you see are from the incremental boost being added catching up with the ideal trigger point. being ahead a couple degrees of ideal finally reaching ideal and giving it a minor bump in power. The crossovers ive seen are normally a fixed point based on the constants in hp power calculation but i didnt think hard on that. as it relates to maximizing a motor in an application you have two degrees of freedom or restriction. peak power or peak efficiency. an auto commutation program calculated the trigger point for both efficiency and power so that when the motor is in use it only blends between those two limitations. if you do dyno runs that you are trickling in the right amount of timing offset for every discrete rpm you can use this to create a table that an rc guy can use to set his timing. so if you have a track 1000 ft long and you want to run it in 10 seconds you can calculate the average rpm to do this. you set the blinks timing to this 1 end bell setting and you will have max power for that motor on that track. if you then did a series of tests that allowed you to calculate the exact amount of heat that the motor could dissipate continuously and in a 5 minute period you could use a thermal time constant to limit the amount of power (a different average rpm) that is above peak efficiency but below peak power. this is fundamentally what a servo drive does in field oriented control continuously but because an industrial servo is updating the thermal model in real time it can adjust peak power and peak efficiency timing (commutation) on the fly. its also predictable with a thermal time constant. what this means is you can have a published power curve that is limited by heat and as long as all the calculated points on the curve average below the continuous portion of the curve you can have peaks that are above the average 100% duty cycle portion of the curve.
That must be the best video on UA-cam. Everybody repeats what he read elsewhere, but you are really going beyond that and pushing your analysis. Awesome work and explanations! Thank you RCCrewChief
i suspect the knees that you see are from the incremental boost being added catching up with the ideal trigger point. being ahead a couple degrees of ideal finally reaching ideal and giving it a minor bump in power. The crossovers ive seen are normally a fixed point based on the constants in hp power calculation but i didnt think hard on that. as it relates to maximizing a motor in an application you have two degrees of freedom or restriction. peak power or peak efficiency. an auto commutation program calculated the trigger point for both efficiency and power so that when the motor is in use it only blends between those two limitations. if you do dyno runs that you are trickling in the right amount of timing offset for every discrete rpm you can use this to create a table that an rc guy can use to set his timing. so if you have a track 1000 ft long and you want to run it in 10 seconds you can calculate the average rpm to do this. you set the blinks timing to this 1 end bell setting and you will have max power for that motor on that track. if you then did a series of tests that allowed you to calculate the exact amount of heat that the motor could dissipate continuously and in a 5 minute period you could use a thermal time constant to limit the amount of power (a different average rpm) that is above peak efficiency but below peak power. this is fundamentally what a servo drive does in field oriented control continuously but because an industrial servo is updating the thermal model in real time it can adjust peak power and peak efficiency timing (commutation) on the fly. its also predictable with a thermal time constant. what this means is you can have a published power curve that is limited by heat and as long as all the calculated points on the curve average below the continuous portion of the curve you can have peaks that are above the average 100% duty cycle portion of the curve.
Cool video, thanks for the shout out at the end! :-)
No Problem. I'm glad I found your page. Really clarified how timing interacts with the magnetics and coil inductance.
Hai ..i want to ask..this setup for drag or speedrun..? I hope you can apply my comment